Presence Management System

Abstract

According to one embodiment a presence management system including: a first presence server that controls a first network; a plurality of presentities that belong to the first network; a second presence server that controls a second network, the second network connected to the first network via a communication channel; and a plurality of watchers belonging to the second network; wherein the first presence server includes: a first watcher list that registers a given presentity under the first network associated with one of the watchers that requests presence information of the given presentity; and an external notification section that sends the presence information of the given presentity to the second presence server, and wherein the second presence server includes: a second watcher list that registers the one of watchers associated with the given presentity; and an internal notification section that sends the presence information to the one of watchers registered correspondingly to the given presentity.

1 . A presence management system comprising:
 a first presence server that controls a first network;   a plurality of presentities that belong to the first network;   a second presence server that controls a second network, the second network connected to the first network via a communication channel; and   a plurality of watchers belonging to the second network;   wherein the first presence server includes:
 a first watcher list that registers a given presentity under the first network associated with one of the watchers that requests presence information of the given presentity; and 
 an external notification section that sends the presence information of the given presentity in the first watcher list as a presence message to the second presence server through the communication channel, and 
   wherein the second presence server includes:
 a second watcher list that registers the one of watchers associated with the given presentity; and 
 an internal notification section that sends the presence information as the presence message to the one of watchers registered in the second watcher list correspondingly to the given presentity. 
   
   
   
       2 . The presence management system according to  claim 1 ,
 wherein the second presence server updates the one of watchers and the associated given presentity in the second watcher list when receiving a request for presence information with respect to the given presentity is transmitted from the one of watchers, and notifies the first presence server about updated information of the second watcher list including the one of watchers and the associated given presentity as a notification message through the communication channel; and   the first presence server updates the one of watchers and the associated given presentity in the first watcher list in accordance with the notification massage.   
   
   
       3 . The presence management system according to  claim 1 ,
 wherein the second presence server includes a database storing presence information with respect to the plurality of presentities notified from the first presence server;   when the second presence server receives a request for acquiring the presence information of the given presentity, the second presence server confirms whether the given presentity is registered in the second watcher list; and   when the given presentity is registered in the second watcher list, the second presence server notifies the one of watchers through the second network about the requested presence information by reading out the requested presence information from the database.